Php Custom function - Difference between two dates,time and date

The function presented in this page, CalculateDiff(), can be used to get the difference between 2 dates, time and date .

This function takes two parameters: the date1 and date2. It can be used various date / time formats: Unix Timestamp, or a string

Function that returns the difference between two date-time Returns an array containing a string with a textual reprezentation of the difference, and separately: the days, hours, minutes, seconds, total hours, total minutes, and total seconds.

<?
function CalculateDiff($date1, $date2) {
      // sets to use $date1 and $date2 as Unix Timestamp
    if (!is_int($date1))
        $date1 = strtotime($date1);
    if (!is_int($date2))
        $date2 = strtotime($date2);

    // if the difference is negative, the hours are from different days, and adds 1 day (in sec.)
    $diff = ($date2 >= $date1) ? $date2 - $date1 : 86400 + $date2 - $date1;

    // define the number of days, hours, minutes and seconds in difference
    $d = floor($diff / 86400);
    $h = floor(abs($diff - $d * 86400) / 3600);
    $m = floor(abs($diff - $d * 86400 - $h * 3600) / 60);
    $s = $diff % 60;

    // sets the words, singular or plural
    $dstr = ($d == 1) ? ' day ' : ' days ';
    $hstr = ($h == 1) ? ' hour ' : ' hours ';
    $mstr = ($m == 1) ? ' minute ' : ' minutes ';
    $sstr = ($s == 1) ? ' second ' : ' seconds ';

    // setings for the string added in textual reprezentation of the difference
    $sdiff_d = ($d != 0) ? $d . $dstr : '';
    $sdiff_h = ($h != 0) ? $h . $hstr : '';
    $sdiff_m = ($m != 0) ? $m . $mstr : '';

    return array(
        'diff' => $sdiff_d . $sdiff_h . $sdiff_m . $s . $sstr,
        'days' => $d,
        'hours' => $h,
        'min' => $m,
        'sec' => $s,
        'totalhours' => floor($diff / 3600),
        'totalmin' => floor($diff / 60),
        'totalsec' => $diff
    );
}
?>

Examples of CalculateDiff() function usage, with different date-time formats:

 <?php
        // difference between 2 times (in hours:min:sec)
        $rs1 = CalculateDiff('8:35:6', '8:55:34');         
        var_export($rs1);
    ?>

Result:
array (
    'diff' => '20 minutes 28 seconds ',
    'days' => 0, 'hours' => 0, 'min' => 20, 'sec' => 28,
    'totalhours' => 0, 'totalmin' => 20, 'totalsec' => 1228
)

 <?php
        // difference between a previous date-time and now
        $rs2 = CalculateDiff('07/19/2012 14:10:00', 'now');         
        var_export($rs2);
    ?>

Result:
array (
    'diff' => '61 days 16 hours 9 minutes 20 seconds ',
    'days' => 72, 'hours' => 16, 'min' => 9, 'sec' => 20,
    'totalhours' => 1744, 'totalmin' => 104649, 'totalsec' => 6278960
)

 <?php
        // difference between 2 date-times
        $rs3 = CalculateDiff('25 August 2012 14:10:00', '18-09-2012 08:25:00');         
        var_export($rs3);
    ?>

Result:
array (
    'diff' => '23 days 18 hours 15 minutes 0 seconds ',
    'days' => 23, 'hours' => 18, 'min' => 15, 'sec' => 0,
    'totalhours' => 570, 'totalmin' => 34215, 'totalsec' => 2052900
)

 <?php
        // difference between 2 date-time, with Timestamp
        $rs4 = CalculateDiff(1348012438, 1348029429);         
        var_export($rs4);
    ?>

Result:
array (
    'diff' => '4 hours 43 minutes 11 seconds ',
    'days' => 0, 'hours' => 4, 'min' => 43, 'sec' => 11,
    'totalhours' => 4, 'totalmin' => 283, 'totalsec' => 16991
)